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Two pendulums of equal length l = 0.45 m are suspended from the same point. The pendulum bobs are steel spheres. The first bob has mass 0.25 kg and the second has mass 0.85 kg. The first bob is drawn back to a 35 degree angle with the vertical, and then released such that it swings down and collides with the other bob.

a. To what maximum angle will the second bob rise if the collision was perfectly elastic?

b. If the bobs were made of putty such that they stuck together, to what maximum angle will the combined bobs rise after the collision?

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